Avalanches in Wood Compression

被引：70

作者：

Makinen, T. ^{[1
]}

Miksic, A. ^{[1
]}

Ovaska, M. ^{[1
]}

Alava, Mikko J. ^{[1
]}

机构：

[1] Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, Espoo 00076, Finland

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 05期

基金：

芬兰科学院;

关键词：

HETEROGENEOUS MATERIALS; FRACTURE PRECURSORS; CRITICAL-BEHAVIOR; CRACKLING NOISE; FAILURE; MECHANISM; ROCK; LAW;

D O I：

10.1103/PhysRevLett.115.055501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Wood is a multiscale material exhibiting a complex viscoplastic response. We study avalanches in small wood samples in compression. "Woodquakes" measured by acoustic emission are surprisingly similar to earthquakes and crackling noise in rocks and laboratory tests on brittle materials. Both the distributions of event energies and of waiting (silent) times follow power laws. The stress-strain response exhibits clear signatures of localization of deformation to "weak spots" or softwood layers, as identified using digital image correlation. Even though material structure-dependent localization takes place, the avalanche behavior remains scale-free.

引用

页数：5

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